I have seen many threads in Services sections which are offering acceleration of the the Bitcoin transactions for free or for some tips. Can anyone tell me how they are doing this and is there anyway anyone can do this process himself/ Herself without being depended on anyone.
You can try the ViaBTC accelerator. I'm not 100% sure that it works, but I usually use it if I send a transaction with low fee and I usually get confirmation in 1-2 hours time after the acceleration. I'm not 100% sure that it is because of the accelerator service, but it won't harm if you give it a try.
I'm not advertising them, it's just my usual way of working.
https://pool.viabtc.com/tools/txaccelerator/